Herb & supplement monograph

Riboflavin Drug Interactions, Uses, Effectiveness, Safety & More

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS ·Updated July 2026

What is this page for?

First and foremost: how Riboflavin interacts with medications. The heart of this page is the interaction list — every drug Riboflavin is known to interact with, and how serious each one is.

But these pages have grown well beyond that into a full monograph — what Riboflavin is, what people use it for and how strong the evidence is, its safety and side effects, and answers to the questions we’re asked most — written and reviewed by the clinical staff at HelloPharmacist. It’s educational information from our licensed clinical databases, not medical advice, and we don’t sell or endorse products. Our editorial policy

Check Riboflavin against your medication

Add one medication

✓ Supplement

Riboflavin

1 Your medication

Start typing any prescription or over-the-counter drug name.

Reviewed by licensed pharmacists Sourced from Natural Medicines

On this page

Riboflavin Drug Interactions: The Bottom Line

From the HelloPharmacist Editorial Team · Updated July 2026

Based on the available evidence, the overall risk of a clinically significant Riboflavin drug interaction appears low for most people. None of the listed interactions are rated major, and the main documented concern comes from lab research rather than studies in people.

Interactions deserving the most attention

The interaction that deserves the most attention involves tetracycline antibiotics. Lab studies suggest riboflavin might make these antibiotics less potent, which could matter when treating an infection. That said, this effect has not been reported in humans, so it remains a theoretical caution rather than a proven problem. Beyond this, no medication category in riboflavin's profile stands out as a well-documented, serious concern.

What the rest of the list means

Riboflavin is linked to a fair number of medications on paper, but that does not mean each combination is harmful. The interactions rated moderate here rest on laboratory findings, not on real cases in people, and a predicted effect in a test tube often does not translate into a meaningful change in the body. As vitamin B2, riboflavin is a nutrient the body uses every day, which fits with its generally quiet interaction record.

Check your medications against Riboflavin

Based on HelloPharmacist’s Riboflavin interaction data and reviewed under our editorial standards.

Interaction report

Drugs that interact with Riboflavin

20 medications have a known interaction with Riboflavin, graded by severity. Select any drug for the full evidence-based detail.

Don’t want to scroll the list? Just ask.

Tell us the medications you take and we’ll check each one against Riboflavin using our pharmacist-reviewed interaction data.

AI summaries are generated from our Riboflavin interaction data for education only — always confirm with your pharmacist. How we use AI

2,830 drugs

Read The List Like a Pharmacist

What Severity, Likelihood & Evidence Mean

Severity — How Serious It Can Be

Major. Clinically significant; generally best avoided, or used only under direct professional supervision.
Moderate. May need monitoring, a dose adjustment, or separating the times you take each one.
Minor. Generally not clinically significant, but still worth noting and mentioning to your pharmacist.
No known interaction. Checked against our sources with nothing documented — not the same as proven safety.

Likelihood — How Well It’s Documented

Likely. Well-controlled human studies have demonstrated the likely existence of this interaction
Probable. Interaction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
Possible. Interaction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists
Unlikely. Interaction has been demonstrated in animal or in lab research but has been shown not to occur in humans.

Where This Data Comes From

Interaction records are evidence-graded and sourced from the Natural Medicines database (TRC Healthcare), the same reference used by pharmacists and hospitals.
Each drug listed above links to the full report for that exact Riboflavin combination — clinical detail, likelihood, evidence level, and citations.
Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

The big picture

The kinds of drugs Riboflavin affects

Every type of medication (drug category) Riboflavin is known to interact with. Open any category for the detail — or search your exact drug in the checker above.

All 1 drug category Riboflavin interacts with

Tetracycline Antibiotics

Theoretically, taking riboflavin with tetracycline antibiotics may decrease the potency of these antibiotics.
In vitro research suggests that riboflavin may inhibit the potency of tetracycline antibiotics. It is not clear if this effect is clinically significant, as this interaction has not been reported in humans.

Likelihood Possible Evidence D

Monograph

Riboflavin: Uses, Safety & Side Effects

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS · Reviewed July 2026 ·

The bottom line

Riboflavin (vitamin B2) is an essential nutrient your body needs to turn food into energy and to keep skin, eyes, and nerves healthy. It is generally very safe at typical doses, and the strongest evidence supports its use for treating deficiency, with some supportive (but not definitive) evidence for preventing migraines.

Part used: Vitamin (water-soluble B vitamin)
Common forms: Tablets, capsules, softgels, multivitamins, B-complex products, fortified foods

People commonly use it for

Riboflavin deficiency
Migraine prevention
General energy and metabolism support
Healthy skin and eyes

Popular and traditional uses — not proof it works. See “Uses & effectiveness” below for the evidence.

Safety at a glance

OverallLikely safe

Riboflavin is considered very safe; excess is removed in the urine.

PregnancyLikely Safe

When used orally and appropriately in dietary amounts. A tolerable upper intake level (UL) has not been established.

Read the full pregnancy detail

BreastfeedingLikely Safe

When used orally and appropriately in dietary amounts. A tolerable upper intake level (UL) has not been established.

Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center). Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Jump to a section

Overview

Riboflavin, also called vitamin B2, is a water-soluble vitamin that your body needs every day. Unlike herbs, it does not come from a single plant. It is found naturally in many foods, including milk, eggs, lean meat, organ meats, leafy green vegetables, almonds, and enriched or fortified grains and cereals.

Because riboflavin dissolves in water, your body does not store much of it. This means you need a steady supply from your diet. People who do not get enough may take riboflavin as a single supplement, as part of a B-complex product, or in a multivitamin.

Riboflavin gives some products and urine a bright yellow color. This is harmless and is simply the natural color of the vitamin.

How it works

Inside the body, riboflavin is changed into two active forms called FMN (flavin mononucleotide) and FAD (flavin adenine dinucleotide). These molecules act as helpers (coenzymes) for many chemical reactions.

Their main job is to help your cells release energy from carbohydrates, fats, and proteins. They also help the body recycle other nutrients, support normal cell function, and play a role in handling oxidative stress.

The idea behind using riboflavin for migraine is that it may support the energy-making parts of brain cells (mitochondria). This is a reasonable theory based on its role in metabolism, but the exact benefit in migraine is still being studied.

Effectiveness

Does Riboflavin work?

Here’s what the research actually shows for each use — graded by Natural Medicines and reviewed by Dr. Brian Staiger, PharmD.

Evidence overview · 30 uses evaluated

1 Effective 2 Possibly effective 27 Insufficient evidence

How to read these evidence grades

Natural Medicines’ 7-point scale. We show each rating’s label word-for-word.

1EffectiveStrong, consistent evidence it works.

2Likely EffectiveGood evidence, though not yet conclusive.

3Possibly EffectiveSome evidence suggests a benefit.

4Possibly IneffectiveSome evidence it may not help.

5Likely IneffectiveFairly strong evidence it doesn’t help.

6IneffectiveStrong evidence it doesn’t work.

7Insufficient Reliable Evidence to RateToo little research to say either way.

Effective Ariboflavinosis